豆腐文摘：08/28/07

JACS:

1. Carbon Dots for Multiphoton Bioimaging
Li Cao, Xin Wang, Mohammed J. Meziani, Fushen Lu, Haifang Wang, Pengju G. Luo, Yi Lin, Barbara A. Harruff, L. Monica Veca, Davoy Murray, Su-Yuan Xie, and Ya-Ping Sun

Web Release Date: 28-Aug-2007; (Communication) DOI: 10.1021/ja073527l
Abstract Full: HTML / PDF (147K) Supporting Info

【简述】

为什么研究双光子发光？因为低能量的光子穿透力强，绝对适合生物方面的应用。

碳纳米管的垃圾兄弟 - “碳点”(carbon dots)经过Sun博士的努力似乎已经进入了强荧光量子点的大家庭。这些大约10nm以下的碳颗粒不但发着强的荧光（量子产率>10%，参见文献[11]），而且能够一次吸收两个低能量光子(800nm)发光，吸收度达到~40,000GM (对比著名的CdSe/ZnS量子点的双光子吸光度~50,000GM)。水溶性的碳点能够穿透乳腺癌细胞MCF-7的细胞膜，方便地进行双光子成像。碳点进入机理大致是内吞作用(endocytosis)（类似Hongjie Dai的碳管）。另外有趣的是，这些碳点只在细胞质徘徊，完全没有进入细胞核。想像在碳点表面接上特殊的DNA，那么基因输送到细胞核肯定又是一篇JACS。哈哈。

Small:

1. Direct Enrichment of Metallic Single-Walled Carbon Nanotubes Induced by the Different Molecular Composition of Monohydroxy Alcohol Homologues (p NA)
Yu Wang, Yunqi Liu, Xianglong Li, Lingchao Cao, Dacheng Wei, Hongliang Zhang, Dachuan Shi, Gui Yu, Hisashi Kajiura, Yongming Li
Published Online: 13 Aug 2007 DOI: 10.1002/smll.200700241
Abstract References Full Text: PDF (Size: 934K)

2. Why Semiconducting Single-Walled Carbon Nanotubes are Separated from their Metallic Counterparts (p NA)
Jing Lu, Lin Lai, Guangfu Luo, Jing Zhou, Rui Qin, Dan Wang, Lu Wang, Wai Ning Mei, Guangping Li, Zhengxiang Gao, Shigeru Nagase, Yutaka Maeda, Takeshi Akasaka, Dapeng Yu
Published Online: 20 Aug 2007 DOI: 10.1002/smll.200700127
Abstract References Full Text: PDF (Size: 949K)